Delivery mechanism for printing-presses.



B. D. STEVENS.

DELIVERY MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED NOV. 10. I913. RENEWED MAR. 11.1915..

Patented 001;. 19, 1915.

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BURT D. STEVENS, OF RIVERSIDE, ILLINOIS, ASSIGNOR TO THE MIEHLEBRINTI-NG PRESS 8: MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, ACORPORATION OF ILLINOIS.

Application filed November 10, 1913, Serial No. 800,016. Renewed March17, 1915.

To all whom it may concern..-

Be it known that I, BURT D. STEVENS, a citizen of the United States,residing at Riverside, in the county of Cook and State of Illinois, haveinvented certain newand useful Improvements in Delivery Mechanism forPrinting-Presses," of which the following is a specification.

The invention has for its object the provision of mechanism to effect adelivery of printed sheets from the impression cylinder to the pile offinished sheets in such a way as to insure the uniform stacking of thesame in a vertical pile and to obviate the danger of offset or blur dueto the relative movement or shifting of one sheet upon another.

Ordinarily as each sheet is carried by the delivery mechanism to anddeposited upon the pile of sheets previously printed there is a tendencyof the sheet to sag at the last moment before it'is released by thegripper of the deliverv mechanism and to Wipe over the freshly printedsurface of the preceding sheet on the pile, and it is for the purpose ofavoiding this action of the delivery and causing the newly deliveredsheet to drop vertically into place on the top of the pile that thepresent invention isdesigned.

In order that the invention and the mannor of its operation'maybereadily understood a preferred embodiment of the same is set forth inthe accompanying drawing and in the following description based thereon.

The invention is, however, ceptible of embodiment in other and variedconstructional forms wherefpre the draw-.

ing and description sire to beconstrued in an illustrative and not in anunnecessarily limiting sense.

In the drawing is set forth in aidiagrammat-tic .manner theimpressi'oncylinder 11, the

pression from the form upon the bed While upon the impression cylinder11, is

Specification of Letters Patent.

obviously sus- DELIVERY MECHANISM FOR PRINTING-PRESSE S.

Patented ea. in, was.

Serial No. 15,081.

sheet as distinguished from a carrier upon which the sheet merely restswithout being engaged thereby.

As it is impracticable to extend the supporting slats 22 over the table15 so as to support the paper until it is finally released by thegrippers 21, the rear portion of the sheet 19 ordinarilydrops upon thepile of sheets indicated at 21 as soon as it leaves the supporting slatsand consequently wipes over the surface of the sheets 21 during thefinal portion of its movement and until it is released by the grippers21 and permitted to fall upon the other sheets.

In order to hold the freshly printed sheet in substantially the plane ofthe delivery and out of contact with the pile of printed sheets until itis finally released and permitted to drop thereon I have provided asuction restraining device which operates upon the trailing free portionof the sheet so as to maintain the same taut. As illustrated thisrestraining device consists of a suction pipe 23 extending horizontallybeneath the path of the sheet and havihg upon its upper face a series oforifices 2lthrough which suction generated by the exhaust fan 25 iscaused to act upon the sheet after it 3 leaves the supporting slats,whereby the same is maintained under tension as it is drawn forward bythe grippers 21. The suction pipe-23 is arranged adjacent that edge ofthe table 15 which is nearest the impression cylinder and means areprovided to interrupt the suction action at the instant following therelease of the sheet by the grippers 21. The interruption of thesuctiontakes place substantially simultaneously with the release of the sheetby'the grippers but just sufiiciently subsequent thereto to' overcomethe momentum of the sheet and to permit it to drop vertically onto thepile after its release;

\Vhile the means'provided for interrupting the suction form ofthemselves no part )rinted sheets. Moreover, the sect of thepreseht'invehtion and various lt'oi-ms of mechanism may be employed forthis pup pose l have indicated, by Way of illustratioiainterrupting-means comprising; a slide 26 arranged to cover and uncoverthe apertures when acted upon. by a tepgiet 2! carried by the cleiivez-ytape, the return of slide being effected, for instance, by a spring notshown.

From the foregoing it Will be readily understood that the sheet of papercarried by the delivery tepe is retarded in its ti'ailing operation andthus prevented from. sagging into eontect with the pile of printedsheets over which it is pessin that in the instant following; itsrelease by the grippers ofithe delivery mechanism the suction acting;upon its edge is likewise interrupted and sheet is permitted to dropvei'tieal'iy upon the pile pi'eviously printed sheets thus avoiding; anybhiiacing action due to Wiping contact between she sheets and alsoinsuring the stacking of the sheets in a uniform pile.

The suction device is fixed or stationary during its action upon theprinted Sheet, and therefore it does not impart say posh tive movementto the printed sheet, hot iii opposition to the feeding; 11love? mootimparted to the printed sheet by the conveying mechanism, therebyahsoluteiy prevent any endvvise movement of the printed sheet when itsettles upon the pile of vice act upon the unm-inted side of t4 printedsheet, and therebv smearing of the freshly printed matter is effectuallyobviated Without in 2113 111311118?WVlHVZSOQVE? ill-- 'terfeiihg with01' reducing; the restraining influence oi the suction device.

I claim:

l, The combination with a printing couple, of sheet delivery mechanismcompris ing gripper means arranged to take the sheet from the printingcouple and to convey the same therefrom, restraining means actingconcurrently with the grippers but upon the unprinted of the rearportion of the sheet to exert tension thereon in opposition to-thegripper means, the grippers and the restraining means arranged torelease the sheet in the order roamed.

2. The combination with a printing oouple, of sheet delivery mechanismoomoi'ising gi'ippei's arranged to thei'ront edge of the sheet and todraw the same from the, printing couple and to convey the sametherefrom, restraining means acting; concur rently with the grippers butupon {the 1131-- printed side of the trailing portiorl of the sheet toexert tension thereon in opposition to the grippers, and means torelease the sheet from the grippers and to interrupt the action of therestraining; means upon the sheet in the order named. 7

3., The combination with e priming couuses 21o ple, of a deliverym.%l1&i1l5"i eon traveling gripper mechanism is Q 7 conveying the sheettherefrom. and a tion device to Slllllh therewith upon the trailingpoirtio unprinted side of the sheet to a ion thereon, said suctiondevice h tionary during its-action on sheet. i l

The combination with a pirintii ple, of delivery mechahisio a grippermechanism for takiw and the sheet therefrom, a section arranged to hetlLVQiSiBil h tie on side of the moving sheet sioh thereom said sue"ple, of a delivery mechanism ti'em'eiisg gripper meal aiiisiii fol iooi'iveying' sheet the ill-om, a vice arranged to act simoltaiieoa withopen the portion I printed side of she t to exam on the sheet, and meansto der the suction de i e i110 tion vice statioo. the sheet.

6. The combination with pi ple of a delivery meehaism traveling;mechanism for conveying th therefrom, a sii vice arrange to he traversedby ing sheet i and means to interrupt the action of '55:? tion de icesubstantially that the sheet is by mechanism.

'Z. Tihe co'hibination with a pri; der of adeliveiy iiioehanisi Itravelinggripper meehehiszii for mi' conveyingfthe sheet thereitom a svice ai'rshged to be traversed hf; printed side of the moviii sheet wt atension thereon, and means to pr call'y render the suction deviceinopeia said suction device being stationary ii acting on the sheet anddisposed at that e of the delivery table nearest the cylir 8. Thecombination with a pl'ii1.-'l'l'l* pie, of'a delivery mechanism compi'traveling gripper meohshisiii for ta. eonveyfiig the therefrom a secvice arranged to-he l l sheet and exert a tension 10 is being drawn bythe drawing means, means for disconnecting the sheet from the drawingmeans, and means for subsequently interrupting the action of the suctiondevice.

In testimony whereof I have hereunto signed my name in thepresence oftwo subscribing Witnesses.

Witnesses:

LEWIS T. GREIsT, T. D. BUTLER.

BURT STEVENS.

